Vaso-occlusive device

Abstract

A vaso-occlusive device includes a first wire having a first cross-sectional geometry and a second wire having a second cross-sectional geometry, where the first cross-sectional geometry is different from the second cross-sectional geometry. The first wire may be wound to form a first coil, where the second wire is wound to form a second coil defining a lumen therein, and where the first coil is disposed at least partially in the lumen. The first wire and the second wire may be co-wound to form a single coil.

1 . A vaso-occlusive device, comprising:
 a first wire having a first cross-sectional geometry and   a second wire having a second cross-sectional geometry, wherein the first cross-sectional geometry is different from the second cross-sectional geometry.   
     
     
         2 . The vaso-occlusive device of  claim 1 , wherein the first wire is wound to form a first coil,
 wherein the second wire is wound to form a second coil defining a lumen therein, and   wherein the first coil is disposed at least partially in the lumen.   
     
     
         3 . The vaso-occlusive device of  claim 2 , wherein the first wire has a first cross-sectional area,
 wherein the second wire having a second cross-sectional area, and   wherein the first cross-sectional area is different from the second cross-sectional area.   
     
     
         4 . The vaso-occlusive device of  claim 2 , wherein the first wire is made from a first material,
 wherein the second wire is made from a second material, and   wherein the first material is different from the second material.   
     
     
         5 . The vaso-occlusive device of  claim 2 , wherein at least one of the first and second wires is made from a plurality of wires that are twisted together. 
     
     
         6 . The vaso-occlusive device of  claim 2 , wherein one of the first and second coils is wound in a clockwise direction and the other of the first and second coils is wound in a counter-clockwise direction. 
     
     
         7 . The vaso-occlusive device of  claim 1 , wherein the first wire and the second wire are co-wound to form a single coil. 
     
     
         8 . The vaso-occlusive device of  claim 7 , wherein the first wire has a first cross-sectional area,
 wherein the second wire having a second cross-sectional area, and   wherein the first cross-sectional area is different from the second cross-sectional area.   
     
     
         9 . The vaso-occlusive device of  claim 7 , wherein the first wire is made from a first material,
 wherein the second wire is made from a second material, and   wherein the first material is different from the second material.   
     
     
         10 . The vaso-occlusive device of  claim 7 , wherein at least one of the first and second wires is made from a plurality of wires that are twisted together. 
     
     
         11 . The vaso-occlusive device of  claim 7 , wherein the second wire forms more than one loop for each loop formed by the first wire. 
     
     
         12 . The vaso-occlusive device of  claim 11 , further comprising discrete contact points between the first coil and the second coil. 
     
     
         13 . The vaso-occlusive device of  claim 11 , further comprising a third wire at least partially co-wound with the first and second wires. 
     
     
         14 . A vaso-occlusive device comprising a coil wire having an un-flattened section, a first flattened section, and a second flattened section,
 wherein a short cross-sectional axis of the first flattened section lies substantially perpendicular to a longitudinal axis of the vaso-occlusive device, and a short cross-sectional axis of the second flattened section lies substantially parallel to the longitudinal axis of the vaso-occlusive device.   
     
     
         15 . The vaso-occlusive device of any of  claims 14 , wherein the un-flattened section of the coil wire has a triangular cross-sectional geometry.